Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quem nomeou o conservador de Ontário em 18 de junho de 1993?
 ###Tabelas: CREATE TABLE tamil_nadu_government_allopathic_western_medical_colleges (tamil_nadu_government_allopathic_western_medical_colleges_id AUTO_INCREMENT PRIMARY KEY, College Name VARCHAR, Location VARCHAR, District VARCHAR, Affiliation VARCHAR, Estd VARCHAR) CREATE TABLE former_medical_schools (former_medical_schools_id AUTO_INCREMENT PRIMARY KEY, Province VARCHAR, School VARCHAR, City VARCHAR, Degree VARCHAR, Established INT, Closed VARCHAR) CREATE TABLE constituency_201-243 (constituency_201-243_id AUTO_INCREMENT PRIMARY KEY, Constituency No. INT, Vidhan Sabha Constituency VARCHAR, Reservation for SC/ST VARCHAR, District VARCHAR, Lok Sabha VARCHAR) CREATE TABLE senators_at_the_beginning_of_the_39th_parliament (senators_at_the_beginning_of_the_39th_parliament_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Party VARCHAR, Province (Division) VARCHAR, Date appointed VARCHAR, Appointed by VARCHAR, Left office VARCHAR) CREATE TABLE seventeenth_round (seventeenth_round_id AUTO_INCREMENT PRIMARY KEY, Pick INT, Team VARCHAR, Player VARCHAR, Position VARCHAR, College VARCHAR)  
SELECT Appointed by FROM senators_at_the_beginning_of_the_39th_parliament WHERE Party = conservative AND Province (Division) = ontario AND Date appointed = june 18, 1993